Essential to make spot checks in the field. Tells whether fence is working and helps locate faults such as ‘opens’, ‘shorts’ and partial grounds. Insert prod into ground and touch fence wire with contact terminal. If lamp does not light check for cracked or dirty insulators, fence wire touching trees, rusty connections or breaks in the wire.

• • Remove fence wire and test across fencer terminals
• • Single lamp – lamp should be bright
• • Lamp is protected by resistor
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